Muhammet SEİS, Serkan SUBAŞI, Muhammed MARAŞLI, Heydar DEHGHANPOUR

Ultra düşük oranlarda SWCNT ilaveli UHPC’lerin mekanik ve elektriksel özelliklerinin incelenmesi

Nanoteknolojinin gelişmesi ile birlikte inşaat sektöründe de özellikle yapı malzemeleri alanında spesifik özelliklere sahip nano malzemelerin kullanılması araştırmacıların ilgisini çekmektedir. Literatüre göre çimentolu malzemelerin karışımlarında karbon nanotüp (CNT)'ler kullanılabilirliği yüksek olan nano malzemeler arasında yer almaktadır. Çok duvarlı karbon nanotüp (MWCNT) ilaveli betonlar üzerinde birçok çalışma olması ile birlikte tek duvarlı karbon nanotüp (SWCNT)'lerin beton üzerinde davranışlarını inceleyen araştırmalar oldukça sınırlıdır. Bu çalışmada çimento ağırlığının % 0.0125, 0.020 ve 0.025 oranlarında SWCNT kullanılarak üretilen ultra yüksek performanslı çimentolu kompozitlerin (UHPC) mekanik ve elektriksel özellikleri araştırılmıştır. Hazırlanan 8 adet UHPC karışımlarının 4 tanesinde sadece SWCNT, 4 tanesinde ise SWCNT+ Mikro çelik fiber katılmıştır. UHPC karışımlarında mikro çelik lifler ağırlıkça %4 oranında kullanılmıştır. İletkenlik ve eğilme deneyleri 12 X 3 X 2 cm numuneler üzerinde gerçekleştirilmiştir. 28 günlük basınç dayanımları, 7 cm çapında ve 14 cm uzunluğunda silindirik numuneler kullanılarak belirlenmiştir. Elektriksel direnç ölçümü için çimentolu malzemelerin ölçümünde yaygın olan iki noktalı tek eksenli yöntem kullanılmıştır. Elde edilen sonuçlara göre SWCNT’nin UHPC’lerin mekanik özellikler üzerinde olumlu etkileri gözlenmiştir. SWCNT eklenmesi ve oranının artmasıyla elektriksel direnç azalmıştır, ancak gerçekleşen akım hızının artırılması için daha yüksek oranlarda SWCNT kullanılmasının gerekli olduğu tespit edilmiştir. Ayrıca mikro çelik lifli karışımlarda elektriksel direnç parametreleri üzerinde SWCNT’nin etkisi daha belirgin olduğu görülmüştür.

Anahtar Kelimeler:

UHPC, Kompozit, Karbon nanotüp, SWCNT, elektriksel direnç

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